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I have the CD, and it shows that # as the double sheave pulley for a '54-'55 (Y-block) 239 and 256. Looks like the outer pulley is for the wide belt and the inner is "normal" (probably for the fan?)
Last edited by ALBUQ F-1; Nov 18, 2007 at 09:02 PM.
Mine had a chunk broken out of the outer pully so I put it on a lathe and removed the outter pully so I could bolt an additional pully there to replace the broken one.
I wouldn't use it on anything but a 239 though because there's no harmonic damper.
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